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FLOOD INSURANCE STUDY CITY OF SAN MARCOS, HAYS AND CALDWELL COUNTIES, TEXAS 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study revises and updates a previous Flood Insurance Study/Flood Insurance Rate Map for the City of San Marcos, Hays and Caldwell Counties, Texas. This information will be used by the City of San Marcos to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP). The information will also be used by local and regional planners to further promote sound land use and floodplain development. In some states or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the state (or other jurisdictional ag~ncy) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this Flood Insurance Study are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. The hydrologic and hydraulic analyses in this study represent a revision of the original analyses prepared by the Soil Conservation Service (SCS) for the Federal Emergency Management Agency (FEMA), under Inter-Agency Agreement No. IAA-H-8-77, Project Order No.9. This work was completed in November 1978. The hydrologic and hydraulic analyses in this updated study were prepared by the Fort Worth District of the U. S. Army Corps of Engineers (COE) under Inter-Agency Agreement No. EMW-84-E-1506, Project Order No. 1, and all amendments thereto. An updated hydraulic analysis for Bypass Creek, prepared by Naismith Engineers, Inc., for the City of San Marcos, was also included in this updated study. The work for this updated study was completed in April 1988. 1.3 Coordination On March 30,1984, an initial Consultation and Coordination Officer's (CCO) meeting was held with representatives from FEMA, the city, and the Fort Worth District of the COE (the study contractor) to determine the streams to be studied by detailed methods. The following agencies, communities, businesses, and persons were contacted for information and coordination af results: the City óf San Marcos, the U. S. Geological Survey (USGS), the U. S. Coast and Geodetic Survey (USC&GS), the Texas Department of-Highways and Public Transportation, Dewberry & Davis, the Texas Department of